send_text_message · Zappaz MCP Server MCP: Risk & Policy

WHAT IT DOES

What send_text_message does on Zappaz MCP Server

AI agents use send_text_message to create or update resources in Zappaz MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Zappaz MCP Server environment.

WHY IT NEEDS A POLICY

Why send_text_message needs a policy

This tool creates and sends data (text messages) to WhatsApp recipients through a remote API, which is a reversible write operation. While not destructive (messages can theoretically be deleted via delete_message), it modifies external state by delivering communication to third parties.

From the tool's definition Tool name 'send_text_message' and description 'Envia uma mensagem de texto atraves da Zappaz API' (Sends a text message through the Zappaz API). The server description states it enables agents to 'send and manage multimedia messages' via WhatsApp.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_text_message Rate-limited

send_text_message stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "send_text_message": {
      "limits": [
        {
          "counter": "send_text_message_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Zappaz MCP Server, so you can run agents against it safely.

FAQ

Questions about send_text_message

What does the send_text_message tool do? +

Envia uma mensagem de texto atraves da Zappaz API. It is categorised as a Write tool in the Zappaz MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on send_text_message? +

Register the Zappaz MCP Server MCP server in PolicyLayer and add a rule for send_text_message: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Zappaz MCP Server. Nothing to install.

What risk level is send_text_message? +

send_text_message is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit send_text_message? +

Yes. Add a rate_limit block to the send_text_message rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block send_text_message completely? +

Set action: deny in the PolicyLayer policy for send_text_message. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides send_text_message? +

send_text_message is provided by the Zappaz MCP Server MCP server (viiniolliveira/zappaz-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.